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Re: [Discuss-gnuradio] decimate by less than 8 in standard FPGA of USRP
From: |
Firas A. |
Subject: |
Re: [Discuss-gnuradio] decimate by less than 8 in standard FPGA of USRP |
Date: |
Tue, 29 Jul 2008 21:55:00 -0700 (PDT) |
Hi,
1) Just use USRP FPGA file (firmware) that contains no halfband filter as in
the following example:
decim = 4
set_fpga_filename="std_4rx_0tx.rbf" # This FPGA firmware contains 4 Rx paths
without halfbands and 0 tx paths.
u = usrp.source_c(0, decim_rate=decim, fpga_filename=set_fpga_filename)
2) See:
usrp_fft.py
Note:
In this case (decimation by 4), you must use 8 bit data format (see the
option -8 in usrp_fft.py) to avoid saturating the USB bus.
Firas
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Firas A. <=